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Top Forums Shell Programming and Scripting Not able to store command inside a shell variable, and run the variable Post 302473156 by gvinayagam on Friday 19th of November 2010 05:03:28 AM
Old 11-19-2010
Not able to store command inside a shell variable, and run the variable

Hi,

I am trying to do the following thing

Code:
var='date'
 
$var

Above command substitutes date for and in turn runs the date command and i am getting the todays date value.

I am trying to do the same thing as following, but facing some problems,

Code:
unique_host_pro="sed -e ' /#/d' \$configFile | awk -v appcode=\"$appcode\" -F\"\$config_del\" '{ if (\$1 == appcode ) print \$0 }' | awk -v unique_host=\"\$unique_host\" -F\"\$config_del\" '{ if ( \$2 == unique_host ) print \$0 }'"

I have stored the sed command in unique_host_pro variable and going to use the variable in multiple places of my script, so i dont have to use the command in multiple places, and also trying to avoid updates to the command in multiple places.

once assigning the above value, i am trying to run the command using

Code:
$unique_host_pro

Getting the following exception

Code:
checkProcess.sh: line 97: sed -e ' /#/d' $configFile | awk -v appcode="$appcode" -F"$config_del" '{ if ($1 == appcode ) print $0 }' | awk -v unique_host="$unique_host" -F"$config_del" '{ if ( $2 == unique_host ) print $0 }': No such file or directory


Please let me know how to correct this error also let me know if the approach is correct.

Last edited by radoulov; 11-19-2010 at 06:07 AM.. Reason: Use code tags, please!
 

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RAKE(1) 						 Ruby Programmers Reference Guide						   RAKE(1)

NAME
rake -- Ruby Make SYNOPSIS
rake [--f Rakefile] [--version] [-CGNPgnqstv] [-D [PATTERN]] [-E CODE] [-I LIBDIR] [-R RAKELIBDIR] [-T [PATTERN]] [-e CODE] [-p CODE] [-r MODULE] [--rules] [variable=value] target ... DESCRIPTION
Rake is a simple ruby(1) build program with capabilities similar to the regular make(1) command. Rake has the following features: o Rakefiles (Rake's version of Makefiles) are completely defined in standard Ruby syntax. No XML files to edit. No quirky Makefile syntax to worry about (is that a tab or a space?). o Users can specify tasks with prerequisites. o Rake supports rule patterns to synthesize implicit tasks. o Flexible FileLists that act like arrays but know about manipulating file names and paths. o A library of prepackaged tasks to make building rakefiles easier. OPTIONS
--version Display the program version. -C --classic-namespace Put Task and FileTask in the top level namespace -D [PATTERN] --describe [PATTERN] Describe the tasks (matching optional PATTERN), then exit. -E CODE --execute-continue CODE Execute some Ruby code, then continue with normal task processing. -G --no-system --nosystem Use standard project Rakefile search paths, ignore system wide rakefiles. -I LIBDIR --libdir LIBDIR Include LIBDIR in the search path for required modules. -N --no-search --nosearch Do not search parent directories for the Rakefile. -P --prereqs Display the tasks and dependencies, then exit. -R RAKELIBDIR --rakelib RAKELIBDIR --rakelibdir RAKELIBDIR Auto-import any .rake files in RAKELIBDIR. (default is rakelib ) -T [PATTERN] --tasks [PATTERN] Display the tasks (matching optional PATTERN) with descriptions, then exit. -e CODE --execute CODE Execute some Ruby code and exit. -f FILE --rakefile FILE Use FILE as the rakefile. -h --help Prints a summary of options. -g --system Using system wide (global) rakefiles (usually ~/.rake/*.rake ). -n --dry-run Do a dry run without executing actions. -p CODE --execute-print CODE Execute some Ruby code, print the result, then exit. -q --quiet Do not log messages to standard output. -r MODULE --require MODULE Require MODULE before executing rakefile. -s --silent Like --quiet, but also suppresses the 'in directory' announcement. -t --trace Turn on invoke/execute tracing, enable full backtrace. -v --verbose Log message to standard output (default). --rules Trace the rules resolution. SEE ALSO
ruby(1) make(1) http://rake.rubyforge.org/ REPORTING BUGS
Bugs, features requests and other issues can be logged at <http://onestepback.org/redmine/projects/show/rake>. You will need an account to before you can post issues. Register at <http://onestepback.org/redmine/account/register>. Or you can send an email to the author. AUTHOR
Rake is written by Jim Weirich <jim@weirichhouse.org> UNIX
November 7, 2012 UNIX
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